It depends on the size of the rock. If you are trying to make a triangle shape with one side being pointy, go to some asphalt or concrete and rub on both sides until its sharp
On a rock
Often, yes.
yes by giving precise force on the razor by the rock can make it sharp
Pick up a rock. Or a stick. sharpen the stick to a point with the rock. Done.
Hammer one rock againt another until a sharp edge is produced. Use this sharp edge like a chisel to sharpen the stick. Do not run around with a pointy stick, you'll put your eye out.
If you're asking what volcanic rock can be sharpened as a cutting tool, the answer is obsidian.
No idea. You might do a search on "scythe stone", which is a sharpening stone used to sharpen scythes.
You hold it firmly and rub it at an angle on apiece of abrasive material like a rock, or smooth concrete.
Sandstone is commonly used as a grinding stone to sharpen tools due to its abrasive properties. Its rough texture helps to remove material from the tool surface and create a sharp edge.
to sharpen (a knife or any blade) is "aiguiser" in French. To sharpen a pen is "tailler un crayon".
The verb of sharpness is sharpen. As in "to sharpen something".
It is wiser to sharpen your wit, instead of your tongue. I would like to sharpen my pencil, please.